Influence of sample preparation on nanoindentation results of twinning-induced plasticity steel

Jiali Zhang; Stefan Zaefferer

doi:10.1007/s12613-021-2260-z

Volume 28 Issue 5

May 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(5): 877-887

Jiali Zhang and Stefan Zaefferer, Influence of sample preparation on nanoindentation results of twinning-induced plasticity steel, Int. J. Miner. Metall. Mater., 28(2021), No. 5, pp. 877-887. https://doi.org/10.1007/s12613-021-2260-z

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Jiali Zhang and Stefan Zaefferer, Influence of sample preparation on nanoindentation results of twinning-induced plasticity steel, Int. J. Miner. Metall. Mater., 28(2021), No. 5, pp. 877-887. https://doi.org/10.1007/s12613-021-2260-z

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Research Article

Influence of sample preparation on nanoindentation results of twinning-induced plasticity steel

Jiali Zhang^{1, 2,} and
Stefan Zaefferer²

+ Author Affiliations

Corresponding author:
Jiali Zhang E-mail: j.zhang@iwm.rwth-aachen.de
Received: 1 October 2020; Revised: 26 January 2021; Accepted: 26 January 2021; Available online: 2 February 2021

Abstract

Abstract

Nanoindentation is an attractive characterization technique, as it not only measures the local properties of a material but also facilitates understanding of deformation mechanisms at submicron scales. However, because of the complex stress–strain field and the small scale of the deformation under the nanoindenter, the results can be easily influenced by artifacts induced during sample preparation. In this work, a systematic study was conducted to better understand the influence of sample preparation methods on the nanoindentation results of ductile metals. All experiments were conducted on a steel (Fe–22Mn–0.65C, wt%) with twinning-induced plasticity (TWIP), which was selected for its large grain size and sensitivity to different surface preparation methods. By grouping the results obtained from each nanoindent, chemical polishing was found to be the best sample preparation method with respect to the resulting mechanical properties of the material. In contrast, the presence of a deformation layer left by mechanical polishing and surface damage induced by focused ion beam (FIB) scanning were confirmed by the dislocation-nucleation-induced pop-in events of nanoindentation.
- TWIP steels;
- nanoindentation;
- mechanical polishing;
- chemical polishing;
- pop-in

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References

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